CONNECTORS FOR FLUID LINES

Description

[0001] The present invention relates to a connector for fluid lines or fluid units. The connector has at least one first connection region, at least one second connection region, a transition region, and a fluid channel. The transition region is arranged between the connection regions. The first connection region has a first fluid channel section, the transition region has a second fluid channel section, and the second connection region has a third fluid channel section of the fluid channel. The fluid channel in the connector is composed of the three fluid channel sections arranged one behind the other and can be flowed through by a fluid.

[0002] The first connection region and the second connection region are arranged at an angle α to one another. The angle α is less than 180° and is preferably 90°. Because the first connection region and the second connection region are arranged at an angle α to one another, the center axes of the first fluid channel section and the second fluid channel section define an imaginary plane E. Both center axes extend in the plane.

[0003] The second connection area has a circular outer contour. The essentially circular outer contour need not be constant over its entire extension; grooves, recesses, and webs are also provided. In any case, the second connection area is designed, for example, for use as a plug with a predefined nominal diameter.

[0004] The term "fluid" refers to any liquid and / or gaseous flow or pressure medium. A connector of this type is suitable for hydraulic, pneumatic, and hydropneumatic applications. A preferred application of the connector according to the invention is the connection of pneumatic braking systems on motor vehicles, particularly trucks.

[0005] Connectors of this type are known in the art in a variety of designs and are widely used in practice. Such connectors are usually made in one piece from either metal, such as brass, or plastic. They are used, in particular, in a motor vehicle for connecting at least two media lines to each other or for connecting at least one fluid line to an assembly.

[0006] In many cases, these are angled connectors, which are particularly designed as injection-molded parts. The connecting areas of the connector are aligned at an angle of between 0° and less than 180° relative to their central axes.

[0007] Such connectors are known, for example, from WO 2010 / 009942 A1. A connector is described that has a connection area designed as a mandrel and can also be connected to an assembly via a plug connection.

[0008] DE 10 2009 039 983 A1 discloses a connector consisting of at least two connection sections, wherein the at least two connection sections are each configured for connection to a media line or a unit and are arranged between a connection section. The connection sections each have an internal connection channel.

[0009] DE 20 2017 102 366 U discloses a fluid fitting for a fluid line comprising a base body. The base body has at least one first channel access and at least one second channel access. Furthermore, an insert chamber is formed in the base body, into which at least one at least two-part insert is inserted.

[0010] DE 195 43 256 A describes a pipe bend for the transport of bulk materials and solid-laden liquids or gases. Instead of a continuous, circularly curved bend, DE 195 43 256 A describes a bend consisting of three segments. The middle segment can have a reinforced wall to increase wear resistance.

[0011] Since the required wall thickness is generally thinner when using metal due to its greater strength than when using plastic, a metal connector can have a larger internal cross-section with the same external cross-section. However, from a material-economic perspective, it is advantageous to manufacture such connectors from plastic due to the higher cost of brass compared to plastic. Since the external dimensions are often determined by nominal diameters, a tension arises during design between the requirements for the mechanical stability of the connector and its flow properties.

[0012] The invention is therefore based on the object of providing a connector which is cost-effective and easy to manufacture and whose flow properties are at least equivalent to or better than known connectors.

[0013] The above-mentioned object is achieved in a generic connector by the characterizing part of claim 1.

[0014] In a connector it is provided that the third fluid channel section in the second connection region has a cross-section deviating from a circular shape at least in a first partial section, that a wall surrounding the third fluid channel section at least in the first partial section has at least one first circumferential region arranged outside the plane E and having a pressure wall thickness, and that the wall surrounding the first partial section has at least one second circumferential region intersecting the plane E and having a support wall thickness that is increased compared to the pressure wall thickness.

[0015] Polygonal cross-sections, polygonal cross-sections with rounded corners and / or rounded, particularly convex, side edges have proven suitable for non-circular cross-sections for the fluid channel, particularly in the third fluid channel section. Oval cross-sections or cross-sections with a curved profile are also possible. The term "cross-section" always refers to the cross-section that extends orthogonally to the respective central axis of the fluid channel at the location under consideration or through which the central axis passes as a normal.

[0016] The wall surrounding the third fluid channel section in the first subsection has, at least in the first subsection, at least one first circumferential region with a pressure wall thickness arranged outside the plane E. The plane E is defined by the center axes of the first fluid channel section and the third fluid channel section. The first circumferential region, whose surrounding wall has at least one pressure wall thickness, therefore extends such that it does not intersect the plane E. The circumferential region with the pressure wall thickness is arranged above or below or to the left or right of the plane E, depending on the perspective.

[0017] Preferably, the peripheral region with the pressure wall thickness has a minimum distance from plane E at every point along its extension. For example, the distance corresponds approximately to twice the pressure wall thickness. In particular, the distance is determined as the shortest distance between plane E and an inner flank of the wall along a plane normal to plane E.

[0018] Furthermore, the wall surrounding the third fluid channel section in the first subsection has at least one second circumferential region intersecting plane E with a supporting wall thickness that is greater than the pressure wall thickness. The circumferential region with the supporting wall thickness that is greater than the pressure wall thickness is therefore arranged such that it intersects plane E at least one point along its extension. The supporting wall thickness is greater than the pressure wall thickness at every point along its extension, particularly within the second circumferential region, when viewed in the radial direction. Over the course of the second circumferential region in the circumferential direction, the supporting wall thickness is either constant or changes over the circumference. The supporting wall thickness is preferably greatest in the intersection area with plane E and decreases with increasing distance from plane E - in the normal direction.Preferably, the retaining wall thickness varies in the direction of the extension of the first section, but in particular is greater than the compression wall thickness at every point.

[0019] The wall thickness is determined in the radial direction, along a straight line starting from the central axis of the third fluid channel section.

[0020] For example, the supporting wall thickness in the groove base of a groove for a seal, in particular for a fluid and / or protective seal, is the smallest, but in particular greater than the pressure wall thickness.

[0021] According to the invention, the connector is formed from a plastic, for example, as an injection-molded part or by means of additive manufacturing processes. Polyamide, in particular polyamide 6.6 (PA 6.6) and polyamide 12 (PA 12), has proven advantageous. It is also particularly preferred that the connector be made from a glass fiber-reinforced plastic, in particular plastic with a glass fiber content of at least 30%, preferably exactly 30% (GF 30), or a glass fiber content of at least 50%, preferably exactly 50% (GF 50). According to the invention, the connector is formed in one piece.

[0022] The present invention is based on the finding that the dimensioning of the wall thickness of the wall surrounding the third fluid channel section, particularly in the first subsection, does not have to be based on the mechanical loads occurring, particularly due to bending, in every circumferential region. According to the invention, different circumferential regions are dimensioned separately, namely based on the loads that exclusively or predominantly occur in each case, for example, operating pressure or bending. This is particularly advantageous for a connector made of a plastic.

[0023] Preferably, those circumferential areas that are predominantly or exclusively subjected to the operating pressure of the fluid within the connector are dimensioned based solely on the fluid pressure. Furthermore, those circumferential areas whose maximum load is predominantly caused by mechanical stress, in particular bending, are dimensioned based on this mechanical stress and reinforced accordingly.

[0024] The invention is further based on the finding that the greatest mechanical loads on the connector, in particular the second connection region, result from bending with components in plane E. The load is caused in particular by forces on the first connection region with force components in plane E. In particular, the circumferential regions intersecting plane E are therefore designed with a wall thickness that is greater than the compressive wall thickness. By increasing the wall thickness in the second circumferential region, the bending section modulus of the second connection region is increased, in particular in the first subsection. Furthermore, the resistance to shear loads is increased.

[0025] The circumferential areas located outside the plane E, in particular the circumferential areas arranged at a distance from the plane E, are predominantly loaded by the operating pressure of the fluid within the connector, so that the areas are dimensioned with a corresponding pressure wall thickness.

[0026] The invention has the advantage over the prior art that the load-optimized dimensioning of the wall thickness ensures cost-effective production while simultaneously achieving equivalent or better flow characteristics, particularly flow rate, and equivalent resistance to the loads encountered during operation compared to known connectors. This applies particularly to the production of plastic connectors.

[0027] According to a first embodiment of the connector, it is therefore provided that the pressure wall thickness is dimensioned on the basis of a bursting pressure, taking into account a material of the connector and the maximum operating pressure in the connector, in particular with a safety margin of at least 15%, in particular between 40% and 80%.

[0028] The pressure wall thickness is therefore dimensioned to withstand the typical operating pressure of the connector. The typical operating pressure of the connector is between 0 bar and 20 bar, specifically between 0 bar and 15.5 bar. The maximum operating temperature is approximately 100 °C.

[0029] The burst pressure has a value corresponding to four times the maximum operating pressure, particularly at a temperature between 20 °C and 26 °C, preferably at a temperature of approximately 23 °C. The pressure wall thickness is preferably dimensioned according to the requirements of ISO 7628 (as of February 2010). Advantageously, the connector, in particular the pressure wall thickness, is designed based on the burst pressure of ISO 7628 (as of February 2010).

[0030] For example, the pressure wall thickness is dimensioned to withstand four times the maximum operating pressure, in particular at a temperature between 20 °C and 26 °C, preferably at a temperature of about 23 °C.

[0031] Alternatively or additionally, the pressure wall thickness is dimensioned so that the bursting pressure at a temperature of 100 °C corresponds to approximately two to three times, in particular 2.5 times, the maximum operating pressure.

[0032] For example, the pressure wall thickness is dimensioned such that the burst pressure at a temperature between 20 °C and 26 °C, preferably at a temperature of approximately 23 °C, is in the range between 40 bar and 80 bar, preferably between 55 bar and 65 bar. In particular, the burst pressure at an operating temperature of 100 °C is approximately between 20 bar and 45 bar.

[0033] The connector is preferably made of plastic. For example, the support wall thickness varies by up to 50%, preferably approximately 5% to 10%, along its circumference. The compression wall thickness is preferably approximately 1.4 mm. The support wall thickness is preferably approximately 2.775 mm.

[0034] According to a further embodiment of the connector, it is also provided that the supporting wall thickness is dimensioned based on the maximum mechanical loads occurring in the first subsection, in particular loads not resulting from an operating pressure, in particular bending with a component in plane E. During operation, a bending load on the second connection area with force components in plane E can occur. This load results, for example, from a force - with a component oriented in plane E - acting on the first connection area, which force is transmitted via the transition area to the second connection area. In the areas intersecting plane E, the second connection area, in particular the wall surrounding the fluid channel, is therefore designed to be larger than the pressure wall thickness.

[0035] In particular, in order to further increase the resistance of the connector to bending loads, it is provided according to the invention that the wall surrounding the third fluid channel in the first subsection has at least two first circumferential regions arranged opposite one another and outside the plane E and having the pressure wall thickness, and that the wall surrounding the third fluid channel section in the first subsection has at least two second circumferential regions arranged opposite one another and intersecting the plane E and having at least the support wall thickness.

[0036] In the first subsection, the circumferential regions with the pressure wall thickness are therefore provided on opposite sides of the circumference above and below plane E, or to the left and right of plane E, since in these regions only or primarily the operating pressure occurring within the fluid channel must be supported by the wall of the connector. In the regions where the mechanical load must also be supported, the wall is reinforced in two oppositely arranged, second circumferential regions. The support wall thickness is a wall thickness that is greater than the pressure wall thickness. The support wall thickness is greater than the sealing wall thickness.

[0037] The mechanical loads on the second connection area occur particularly in the areas where the second connection area protrudes from the unit after assembly, for example, in a unit. According to a further embodiment, it has therefore proven advantageous if the first subsection is formed directly adjacent to the transition area. The peripheral areas with the supporting wall section extend from the transition area toward the end area of ​​the second connection area, which is modified from the transition area.

[0038] In order to advantageously optimize the flow rate through the fluid channel, according to a further embodiment of the connector, the cross section of the first fluid channel section is circular, and the second fluid channel section is at least partially non-circular. It is preferably provided that the first fluid channel section with a circular cross section transitions into the second fluid channel cross section. Within the transition region, the circular cross section then transitions into the non-circular cross section, which also continues in the third fluid channel section, in particular in the first partial section. In particular, the inner corner region is not rounded and the outer corner region is rounded.Nevertheless, the flow characteristics of the connector remain in an advantageous range, in particular at a pressure of between 0 bar and 20 bar, in particular 15.5 bar, and a nominal diameter of the second connection area of ​​approximately 9.5 mm.

[0039] According to a further embodiment of the connector, it has also proven advantageous if, in the transition region, a transition from a circular cross-section to a non-circular cross-section occurs at an angle α to each other, particularly along the second fluid channel section. For example, if the angle α is exactly 90°, the circular cross-section transitions into the non-circular cross-section at an angle of 90°. This ensures that the change in direction of the fluid flow occurs within the non-circular cross-section.

[0040] For example, in order to further optimize the connector in terms of flow technology and mechanics, according to a further embodiment of the connector it is provided that at least the first circumferential region with the pressure wall thickness and / or at least the second circumferential region with at least the support wall thickness, starting from the second connection region, extend at least partially into the transition region. It is preferably provided that two first circumferential regions with the pressure wall thickness and two second circumferential regions with the support wall thickness, starting from the second connection region, extend at least partially into the transition region. In this way, the mechanical advantages of the first sub-section in the second connection region are at least partially transferred to the transition region. In particular, the non-circular cross-section of the third fluid channel section is partially continued in the second fluid channel section, starting from the second connection region.

[0041] Furthermore, it is also provided that two first circumferential regions with the pressure wall thickness and a second circumferential region with the support wall thickness extend into the transition region. In particular, the support wall thickness in the transition region is arranged opposite the first connection region, intersecting plane E.

[0042] According to a further embodiment, it has been found to be advantageous for the stability of the connector in the transition region if at least the first circumferential region with the pressure wall thickness and / or at least the second circumferential region with at least the support wall thickness extend from the second connection region at least to the level of an imaginary extension of the central axis of the first fluid channel less the radius of the first fluid channel section.

[0043] If, for example, the first connection area and the second connection area are at an angle α of 90° to each other, the circumferential area with the pressure wall thickness or the circumferential area with the support wall thickness extends up to the level of the inner cutting edge of the first fluid channel section and the second fluid channel section.

[0044] Furthermore, it is provided that the first circumferential region with the pressure wall thickness and / or the second circumferential region with at least the support wall thickness extend to the level of an imaginary extension of the central axis of the first fluid channel. Consequently, the regions with the pressure wall thickness or the support wall thickness extend further into the transition region, namely approximately to the level of an imaginary extension of the central axis of the first fluid channel section. This configuration makes it possible, in particular, to improve the mechanical properties of the connector in the transition region and simultaneously increase the cross-section.

[0045] A further embodiment of the connector provides that the second fluid channel section has at least one transition curve, in particular that the transition curve is arranged between a circular cross-section and a non-circular cross-section. The transition curve preferably causes a change in the direction of the fluid flow, preferably by the angle α, within the second fluid channel section. Starting from a circular cross-section arranged in the direction of the first fluid channel section, the transition curve realizes the transition to a non-circular cross-section of the second fluid channel section, which is preferably arranged in the direction of the third fluid channel section. For example, the transition curve opens at least partially into a circumferential region with supporting wall thickness.

[0046] According to a further embodiment, it is advantageously provided that the transition curve has an extension transverse to the longitudinal extension of the first fluid channel section that approximately corresponds to the diameter of the first fluid channel section or is preferably larger than the diameter of the first fluid channel section. This ensures that the fluid is advantageously deflected. Furthermore, it is provided that a radius of the transition curve in the extension of the first fluid channel section approximately corresponds to the radius of the first fluid channel section.

[0047] According to a further embodiment of the connector, it is provided that the second fluid channel section is delimited by at least one flat surface, preferably that the flat surface is arranged such that the central axis of the first fluid channel section passes through the flat surface as a plane normal.

[0048] The planar surface in the fluid channel of the transition region is preferably realized in that a second circumferential region with supporting wall thickness extends at least partially into the transition region.

[0049] To ensure advantageous flow properties in the fluid channel, according to a further embodiment of the connector, the cross section of the third fluid channel section, at least in the first subsection, has two opposite and parallel straight lines and two oppositely arranged, arcuate segments. Preferably, the straight lines are formed in the regions with the support wall thickness, and the arcuate segments are formed in the regions with the pressure wall thickness. For example, the arcuate segments are convex. The arcuate segments preferably have a curved profile or a radius.

[0050] With an outer diameter of the second connection area between 12 mm and 18 mm, in particular of approximately 12.5 mm, the straight lines have a length between 6 mm and 8 mm, in particular of approximately 7 mm, and the arcuate segments have a cross-sectional radius between 4.25 mm and 5.25 mm, in particular of approximately 4.75 mm. In particular, the outer diameter in the area of ​​an O-ring groove is approximately 12.5 mm, and the largest outer diameter is approximately 16 mm.

[0051] The cross-section of the third fluid channel section—at least in the first subsection—is preferably substantially polygonal with rounded side edges. This cross-section ensures a sufficient flow rate while maintaining stable mechanical dimensions and a circular outer contour.

[0052] According to a further embodiment of the connector, the inventive design of the wall thicknesses in the circumferential regions allows the area of ​​the cross section of the fluid channel in the third fluid channel section to be formed such that, at least in the first subsection, it is larger than the area of ​​the cross section of the fluid channel in the first fluid channel section. The optimized cross-sectional shape realized via the different wall thicknesses achieves a larger area of ​​the cross section of the fluid channel in the third fluid channel section, which ensures a sufficient flow rate. In the circumferential regions with the pressure wall thickness, the cross section is enlarged compared to a known, circular cross section with a wall thickness sufficient for all loads; in the circumferential regions with the support wall thickness, it is kept constant or slightly restricted.

[0053] According to a further embodiment, it has also been found to be advantageous if it is provided that the first partial section of the third fluid channel section extends over approximately one third to one half of the extent of the central axis of the third fluid channel section.

[0054] In order to further optimize the design of the connector, at least one fluid seal is arranged at least on an outer circumference of the second connection region to seal against an operating pressure in the connector. The first sub-section preferably extends at least between the transition region and the fluid seal. In the first sub-section, the pressure wall thickness is preferably dimensioned such that it can withstand the operating pressure within the connector. The support wall thickness is preferably dimensioned such that the mechanical load is supported. Such a design of the first sub-section takes place at least up to the fluid seal, in particular up to an edge of a groove for the fluid seal facing away from the transition region. This ensures that the wall of the second connection region is sufficiently dimensioned for the loads that occur.

[0055] On the side of the fluid seal facing away from the transition area, only mechanical loads need to be borne, since the fluid pressure is applied from both sides to the wall surrounding the third fluid channel section. Dimensioning based on burst pressure is no longer necessary.

[0056] According to a further embodiment, it is preferably provided that a second subsection of the second connection region extends on the side of the first subsection facing away from the transition region, and that the third fluid channel section in the second subsection has a cross-section that deviates from a circular shape. The wall surrounding the third fluid channel section in the second subsection has at least one second circumferential region that intersects the plane E and has the supporting wall thickness. Furthermore, it is provided that the supporting wall thickness in the circumferential region intersecting the plane E and / or the extension of the circumferential region over the entire circumference continuously reduces in the direction of an end region of the second connection region facing away from the transition region.The retaining wall thickness and / or its extension over the entire circumference in the second subsection therefore decreases toward the end region, particularly in the circumferential region intersecting plane E. The mechanical loads during operation decrease toward the end region facing away from the transition region, so that the retaining wall thickness can also be reduced toward the end region.

[0057] To ensure compatibility of the connector with existing systems, a further embodiment provides that the cross section of the third fluid channel section in the second subsection transitions from a non-circular cross section to a circular cross section in the end region of the second connection section facing away from the transition region, while changing the wall thickness, in particular by reducing the supporting wall thickness and / or the extent of the circumferential region over the entire circumference. This ensures that the fluid channel has a circular cross section in the end region of the second connection region.

[0058] According to a further embodiment of the connector, it is particularly advantageous that the second connection area is designed as a connection mandrel for inserting a pipe or hose line and / or the second connection area is designed as a connection plug, in particular for connection to an assembly. The first connection area is preferably designed as a connection mandrel with a circular outer contour, which serves for insertion into a pipe or hose line. The second connection area is designed as a connection plug and can be inserted into a compatible socket.

[0059] Further advantageous embodiments of the invention emerge from the following description of the figures and the dependent subclaims.

[0060] They show: Fig. 1 shows an embodiment of a connector in side view, Fig. 2 shows an embodiment of a connector in a sectional view, mounted in a union screw, Fig. 3a shows a section through an embodiment of a second connection area, Fig. 3b shows a cross section through the second connection area according to Fig. 3a , Fig. 3c a cross section through the second connection area according to Fig. 3a , Fig. 4a, Fig. 4b embodiment of a cross-sectional profile of the fluid channel, Fig. 5a an embodiment of a cross-sectional profile of a fluid channel, Fig. 5b embodiment of a connector to the cross-sectional profile of the Fig. 5a , Fig. 6a an embodiment of a cross-sectional profile of a fluid channel, Fig. 6b an embodiment of a connector to the cross-sectional profile of the Fig. 6a , Fig. 7a an embodiment of a cross-sectional profile of a fluid channel, Fig. 7b an embodiment of a connector to the cross-sectional profile of the Fig. 7a , Fig. 8a an embodiment of a cross-sectional profile of a fluid channel, and Fig. 8b an embodiment of a connector to the cross-sectional profile of the Fig. 8a .

[0061] In In the various figures of the drawing, identical parts are always provided with the same reference symbols.

[0062] With regard to the following description, it is claimed that the invention is not limited to the exemplary embodiments and not to all or several features of described combinations of features, but rather each individual partial feature of the / each exemplary embodiment is also important for the subject matter of the invention, both independently of all other partial features described in connection therewith and also in combination with any features of another exemplary embodiment.

[0063] Fig. 1 shows an embodiment of a connector 1 for fluid lines. The connector 1 has a first connection area 2, a second connection area 3, and a transition area 4. In this embodiment, the transition area 4 is formed between the first connection area 2 and the second connection area 3. The first connection area 2 is designed as a connection mandrel for a pipe or hose line, and the second connection area 3 is designed as a connection plug with a circular outer contour.

[0064] Fig. 2 shows an embodiment of a connector 1 in a sectional view. The embodiment according to Fig. 2 is according to the embodiment in Fig. 1 formed. The connector 1 is inserted, for example, with the second connection area 3 into a corresponding plug socket 5, in particular a union screw. The connector 1 has a fluid channel 6, which has a first fluid channel section 6a in the first connection area 2, a second fluid channel section 6b in the transition area 4, and a third fluid channel section 6c in the second connection area 3.

[0065] In the examples of the Fig. 1 and Fig. 2 the first connection area 2 and the second connection area 3 are arranged at an angle α of 90° to each other. The central axis M1 of the first fluid channel section 6a and the central axis M2 of the third fluid channel section 6c define an imaginary plane E. The section according to Fig. 2 is located on level E.

[0066] Fig. 3a shows the second connection area 3 of an embodiment of a connector 1 according to the embodiments of the Fig. 1 and Fig. 2 . Fig. 3b shows a vertical section in the second connection area 3 according to Fig. 3a along line AA and Fig. 3c shows a section in the second connection area 3 according to Fig. 3a along line BB.

[0067] According to Fig.2 , Fig. 3a und Fig. 3b the third fluid channel section 6c in the second connection region 3 has, at least in a first partial section 7 of the third fluid channel section 6c, a cross-section deviating from a circular shape. In particular, according to Fig. 3b a wall surrounding the third fluid channel section 6c in the first subsection 7 is formed in two first circumferential regions 8 arranged outside the plane E with a pressure wall thickness D. Furthermore, the wall surrounding the third fluid channel section 6c in the first subsection 7 is formed in two second circumferential regions 9 intersecting the plane E with a support wall thickness S that is increased compared to the pressure wall thickness D.

[0068] According to Fig. 3b In the first circumferential regions 8, the pressure wall thickness D is formed, which is dimensioned on the basis of a bursting pressure, taking into account a material of the connector 1 and the maximum operating pressure in the connector, in particular plus a safety margin. The pressure wall thickness D therefore represents a minimum wall thickness resulting from the maximum operating pressure. In the second circumferential regions 9, the wall thickness is increased compared to the pressure wall thickness D, namely with a supporting wall thickness S. The supporting wall thickness S is not constant in the second circumferential region 9 over the course of the circumference, but has a maximum in the plane E. With increasing distance in the normal direction to the plane E, the supporting wall thickness S decreases until the second circumferential region 9 merges into the first circumferential region 8 with the supporting wall thickness S.

[0069] The first circumferential areas 8 with the pressure wall thickness D are opposite each other on the circumference of the Fig. 3b shown cross-section. Likewise, the second circumferential regions 9 with the supporting wall thickness S are arranged opposite one another on the circumference.

[0070] As from Fig. 2 and Fig. 3a As can be seen, the first section 7 is formed directly adjacent to the transition area 4. According to Fig. 2 the cross section in the first fluid channel section 6a is circular and changes into a non-circular cross section in the course of the second fluid channel section 6b.

[0071] The invention can be Fig. 3b can alternatively be considered as follows: Starting from the plane E, the second circumferential regions 9 extend in the cross-section on both sides of the plane E evenly within an angle β. The angle β in the second sub-section 7 is in particular approximately between 80° and 90°, so that starting from the plane E on both sides an angle between 40° and 45° results. The first circumferential regions 8 extend outside the plane E in the remaining circumferential regions 8 of the cross-section at an angle γ, which can be calculated using the formula (360°-(2*β)) / 2.

[0072] As can be seen from Fig. 3b results, in a second partial section 17 in cross section both the support wall thickness S and the extension of the second circumferential region 9 over the entire circumference are reduced, so that the angle β and the support wall thickness S in the second partial section continuously decrease in the direction of an end region 18 of the second connection region 3. Where a first circumferential region 8 adjoins a second circumferential region 9, the support wall thickness S in this embodiment is greater than the pressure wall thickness D. However, it is also provided that the support wall thickness S in this region corresponds at least to the pressure wall thickness D, in particular is the same size.

[0073] Fig. 4 a bis Fig. 8 a and Fig. 4b show exemplary cross-sectional profiles of the fluid channel 6 in the course between the first connection area 2, the transition area 4 and the second connection area 3. Fig. 4a bis Fig. 8a and Fig. 4b thus show images or a negative of the cross section of the fluid channel 6 along its extension. Fig. 4a bis Fig. 8a The cross-sectional profiles shown are, in particular in the transition area 4 and the second connection area 3, the result of the dimensioning of the wall thicknesses in the transition area 4 and the second connection area 3. The dimensioning of the wall thicknesses of the connector can be advantageously described on the basis of the cross-sectional profiles.

[0074] Fig. 5b bis Fig. 8b show embodiments of connectors 1 in sectional view to the respective Fig. 5a bis Fig. 8a shown cross-sectional profiles.

[0075] In all embodiments of the Fig. 4a , b bis Fig. 8a , bThe cross section of the first fluid channel section 6a is circular with a constant radius over its entire length. Furthermore, the cross section of the second fluid channel section 6b is also initially circular in all embodiments, starting from the first fluid channel section 6a.

[0076] In the examples of the Fig. 4a,b bis Fig. 6a,b the transition from the circular cross-section to the non-circular cross-section within the second fluid channel section 6b takes place at an angle of approximately 45°. In the embodiment of the Fig. 7a,b the angle is approximately 20°. In the example Fig. 8a,b the angle corresponds approximately to the angle α of 90°.

[0077] In the embodiment of the Fig. 4a,b In an associated connector 1 - not shown - two oppositely arranged first circumferential regions 8 with the pressure wall thickness D extend from the second connection region 3 into the transition region 4 approximately up to the level of an imaginary extension of the central axis M1 of the first fluid channel section 6a, recognizable by the offset cross-sectional widening (see in particular Fig. 4b ). Furthermore, a second circumferential region 9 with the supporting wall thickness S also extends approximately to the level of an imaginary extension of the central axis M1 of the first fluid channel section 6a, which can be seen from the flattened cross-section of the fluid channel 6, in particular in the second fluid channel section 6b and third fluid channel section 6c.

[0078] In the examples of the Fig. 5a,b und Fig. 6a,b extend with an associated connector 1 - according to Fig. 5b und Fig. 6b - two oppositely arranged first circumferential regions 8 into the transition region 4 up to approximately the level of an imaginary extension of the central axis M1 of the first fluid channel section 6a less the radius of the first fluid channel section 6a, recognizable by the offset cross-sectional change at this level (see in particular Fig. 5a und Fig. 6a ). Furthermore, a second circumferential region 9 extends up to the imaginary extension of the central axis M1 less the radius of the first fluid channel section 6a and a further second circumferential region 9 extends into the transition region 4 up to approximately an imaginary extension of the central axis M1, recognizable by the flattened profile of the cross section.

[0079] In all embodiments of the Fig. 4a , b bis Fig. 8a , b The connector 1 - shown in Fig. 5b bis Fig. 8b - a transition curve 10, which results in a corresponding cross-sectional profile. In the embodiments of the Fig. 4a,b, 5a,b, 6a,b and 8a,b the transition curve 10 has an extension transverse to the longitudinal extension of the first fluid channel section 6a which corresponds approximately to the diameter of the first fluid channel section 6a.

[0080] In the embodiment of the Fig. 7a,b the transition curve 10 has an extension transverse to the longitudinal extension of the first fluid channel section 6a which is greater than the diameter of the first fluid channel section 6a.

[0081] In all embodiments, the radius of the transition curve 10 in the extension of the first fluid channel section 6a corresponds approximately to the radius of the first fluid channel section 6a. In the embodiment of the Fig. 6a,b the arc swept over by the transition curve 10 is larger than in the embodiments of the Fig. 4a,b, 5a,b , 7a,b, 8a,b .

[0082] In all embodiments of the Fig. 4a , b bis 8a , bIt is provided that the second fluid channel section 6b is limited by at least one planar surface, which results from the extension of one of the second circumferential regions 9 with the support wall thickness S into the transition region 4. In the Fig. 4a , b bis Fig. 8a , b This can be seen as a flattening of the cross section in the transition region 4. At least in the first subsection 7 of the third fluid channel section 6c, the cross section in all embodiments according to Fig. 4a , b bis Fig. 8a , b - as exemplified in Fig. 3b shown - two opposite and parallel straight lines 11 and two opposite, arc-shaped segments 12, which connect the straight lines 11 in cross-section. The resulting cross-section is Fig. 4a , b bis Fig. 8a , b can be seen as an example.

[0083] The first section 7 of the third fluid channel section 6c extends in all embodiments of the Fig. 4a , b bis Fig. 8a , b over approximately one third of the extension of the central axis M2 of the third fluid channel section 6c.

[0084] According to Fig. 2 A fluid seal 13 is arranged on an outer circumference of the second connection region 3 for sealing against the operating pressure in the connector 1. The first sub-section 7 preferably extends to an edge 14 of a groove 15 for the fluid seal 13, said edge facing away from the transition region 4. The connector 1 additionally has a dirt seal 16 arranged in a groove 19. A second sub-section 17 of the second connection region 3 is arranged between the edge 14 of the groove 15 facing away from the transition region 4 and the end region 18 facing away from the transition region 4. In the second sub-section 17, the non-circular cross-section changes to a circular cross-section in the end region 18, with a reduction in the wall thickness, in particular the supporting wall thickness S.

[0085] In particular Fig. 3a It can be seen that the reduction of the wall thickness begins directly in the area of ​​the edge 14 of the groove 15. The comparison of the Fig. 3b und 3c It can be seen that the retaining wall thickness S according to Fig. 3c is already significantly reduced and also extends over a comparatively smaller circumference area 9.

[0086] According to Fig. 3a The point with the thinnest wall thickness in the third fluid channel section 6c is formed in a second circumferential region 9 in the groove base of the groove 19. The support wall thickness S present there is greater than the pressure wall thickness D.

[0087] The invention is not limited to the illustrated and described embodiments, but also encompasses all equivalent embodiments within the meaning of the invention. It is expressly emphasized that the embodiments are not limited to all features in combination; rather, each individual partial feature can also have an inventive significance in itself, independently of all other partial features. Furthermore, the invention is not yet limited to the combination of features defined in claim 1, but can also be defined by any other combination of specific features of all the individual features disclosed as a whole. This means that, in principle, practically every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. Bezugszeichenliste

[0088] 1Connector 2First connection area 3Second connection area 4Transition area 5Socket 6Fluid channel 6aFirst fluid channel section 6bSecond fluid channel section 6cThird fluid channel section 7First sub-section 8First circumferential area 9Second circumferential area 10Transition curve 11Straight line 12Arc-shaped segment 13Fluid seal 14Edge 15Groove for 13 16Dirt seal 17Second sub-section 18End area 19Groove for 16 M1Center axis of 6a M2Center axis of 6c A-ASection line B-BSection line DPressure wall thickness SSuspension wall thickness

Claims

1. Connector (1) for fluid lines, having at least one first connection area (2), at least one second connection area (3), a transition area (4) and a fluid channel (6), the transition area (4) being formed between the first connection area (2) and the second connection area (3), the first connection area (2) having a first fluid channel section (6a), the transition area (4) having a second fluid channel section (6b) and the second connection area (3) having a third fluid channel section (6c) of the fluid channel (6), wherein the first connection area (2) and the second connection area (3) are arranged at an angle (α) to one another, wherein the angle (α) is less than 180°, wherein the central axes (M1, M2) of the first fluid channel section (6a) and of the third fluid channel section (6c) define a plane E, and wherein the second connection area (3) has a substantially circular outer contour, wherein the third fluid channel section (6c) has a cross-section deviating from a circular shape at least in a first partial section (7), wherein a wall surrounding the third fluid channel section (6c) at least in the first partial section (7) has at least one first circumferential area (8) arranged outside the plane E with a pressure wall thickness (D), and wherein the wall surrounding the third fluid channel section (6c), at least in the first partial section (6c), has at least one second circumferential area (9) intersecting the plane E with a support wall thickness (S) which is greater than the pressure wall thickness (D), characterized in that the connector (1) is formed in one piece from a plastic, in that the wall surrounding the third fluid channel section (6c), at least in the first partial section (7), has at least two first circumferential areas (8) with the pressure wall thickness (D) arranged opposite one another and outside the plane E, and in that the wall surrounding the third fluid channel section (7), at least in the first partial section (7), has at least two second circumferential areas (9) which are arranged opposite one another, intersect the plane E and have at least the supporting wall thickness (S).

2. Connector (1) according to claim 1, characterized in that the pressure wall thickness (D) is dimensioned on the basis of a burst pressure, taking into account a material of the connector (1) and a maximum operating pressure in the connector (1), in particular the pressure wall thickness is dimensioned so that it can withstand four times a maximum operating pressure in the temperature range between 15 °C and 25 °C.

3. Connector (1) according to claim 1 or 2, characterized in that the support wall thickness (S) is dimensioned on the basis of a maximum mechanical load occurring in the first partial section (7), in particular bending with a component in the plane E, in particular not resulting from an operating pressure.

4. Connector (1) according to any one of claims 1 to 3, characterized in that the first partial section (7) is formed adjacent to the transition area (4).

5. Connector (1) according to any one of claims 1 to 4, characterized in that the cross-section of the first fluid channel section (6a) is circular, and that the cross-section of the second fluid channel section (6b) is at least partially non-circular, in particular that in the transition area (4) there is a transition from a circular cross-section to a non-circular cross-section at an angle (α).

6. Connector (1) according to any one of claims 1 to 5, characterized in that at least the first circumferential area (8) with the pressure wall thickness (D) and / or at least the second circumferential area (9) with at least the support wall thickness (S) extends, starting from the second connection area (3), at least partially into the transition area (4), in particular that at least the first circumferential area (8) with the pressure wall thickness (D) and / or at least the second circumferential area (9) with at least the supporting wall thickness (S) extend, starting from the second connection area (3), at least up to the level of an imaginary extension of the center axis (M1) of the first fluid channel section (6a) minus a radius of the first fluid channel section (6a), preferably at least up to the level of an imaginary extension of the center axis (M1) of the first fluid channel section (6a).

7. Connector (1) according to any one of claims 1 to 6, characterized in that the second fluid channel section (6b) has at least one transitional curve (10), in particular that the transitional curve (10) is arranged between a circular cross-section and a non-circular cross-section, in particular in the second fluid channel section (6b), in particular that the transitional curve (10) has an extension transverse to the longitudinal extension of the first fluid channel section (6a), which corresponds approximately to the diameter of the first fluid channel section (6a) or is greater than the diameter of the first fluid channel section (6a) and / or that a radius of the transitional curve (10) oriented in extension of the first fluid channel section (6a) corresponds approximately to a radius of the first fluid channel section (6a).

8. Connector (1) according to any one of claims 1 to 7, characterized in that the second fluid channel section (6b) is limited by at least one plane surface, preferably in that the plane surface is arranged in such a way that the center axis (M1) of the first fluid channel section (6a) passes through the plane surface as a normal.

9. Connector (1) according to any one of claims 1 to 8, characterized in that the cross-section of the third fluid channel section (6c) has, at least in the first partial section (7), two straight lines (11) arranged opposite and parallel to one another and two arcuate segments (12) arranged opposite one another, preferably in that the arcuate segments (12) are convex, and particularly preferably have a curved shape or a radius.

10. Connector (1) according to any one of claims 1 to 9, characterized in that the area of the cross-section of the fluid channel (6) at least in the first partial section (7) is larger than the area of the cross-section of the fluid channel (6) in the first fluid channel section (6a) and / or that the first partial section (7) of the third fluid channel section (6c) extends over approximately one third to one half of the extension of the center axis (M2) of the third fluid channel section (6c).

11. Connector (1) according to any one of claims 1 to 10, characterized in that at least one fluid seal (13) for sealing against an operating pressure in the connector (1) is arranged at least on an outer circumference of the second connection area (3), preferably in that the first partial section (7) extends at least between the transition area (4) and the fluid seal (13), in particular up to an edge (14) of a groove (15) for the fluid seal (13) facing away from the transition area (4).

12. Connector (1) according to any one of claims 1 to 11, characterized in that a second partial section (17) of the second connection area (3) extends on the side of the first partial section (7) facing away from the transition area (4), in that the third fluid channel section (6c) in the second partial section (7) has a cross-section deviating from a circular shape, in that at least the wall surrounding the third fluid channel section (6c) in the second partial section (7) has at least one second circumferential area (9) intersecting the plane E with the supporting wall thickness (S), and in that the supporting wall thickness (S) in the circumferential area (9) intersecting the plane E and / or the extension of the circumferential area (9) on the overall circumference is continuously reduced in the direction of an end area (18) facing away from the transition area (4).

13. Connector (1) according to claim 12, characterized in that the cross-section of the fluid channel (6) in the second partial section (17) changes from a non-circular cross-section to a circular cross-section in the end area (18) of the second connection area (3), while reducing at least the support wall thickness (S) and / or the extension of the circumferential area (9) on the overall circumference.

14. Connector (1) according to any one of claims 1 to 13, characterized in that the cross-section of the fluid channel (6) is circular at least in an end area (18) of the second connection area (3) facing away from the transition area (4).

15. Connector (1) according to any one of claims 1 to 14, characterized in that the first connection area (2) is designed as a connecting mandrel for insertion into a pipe or hose line and / or the second connection area (3) is designed as a connector plug.